Finding the Fourth Proportional to 12,816.69, 17,687.84 and 7,151.46

Step by Step Solution

1. Step 1: Write the proportion equation
   12,816.69 : 17,687.84 = 7,151.46 : x
2. Step 2: Convert to fraction form
   12,816.69/17,687.84 = 7,151.46/x
3. Step 3: Cross multiply
   12,816.69x = 17,687.84 × 7,151.46
4. Step 4: Simplify right side
   12,816.69x = 126,493,844.49
5. Step 5: Solve for x
   x = 126,493,844.49/12,816.69
6. Step 6: Final answer
   x = 9,869.46